Commit 72c9925f authored by Filipe Manana's avatar Filipe Manana Committed by David Sterba

btrfs: fix extent buffer leak on failure to copy root

At btrfs_copy_root(), if the call to btrfs_inc_ref() fails we end up
returning without unlocking and releasing our reference on the extent
buffer named "cow" we previously allocated with btrfs_alloc_tree_block().

So fix that by unlocking the extent buffer and dropping our reference on
it before returning.

Fixes: be20aa9d ("Btrfs: Add mount option to turn off data cow")
CC: stable@vger.kernel.org # 4.4+
Signed-off-by: default avatarFilipe Manana <fdmanana@suse.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 2c4d8cb7
......@@ -222,6 +222,8 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans,
else
ret = btrfs_inc_ref(trans, root, cow, 0);
if (ret) {
btrfs_tree_unlock(cow);
free_extent_buffer(cow);
btrfs_abort_transaction(trans, ret);
return ret;
}
......
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